EP3459649A1 - Procédé de fabrication d'un article formé à la presse, et chaîne de fabrication - Google Patents

Procédé de fabrication d'un article formé à la presse, et chaîne de fabrication Download PDF

Info

Publication number
EP3459649A1
EP3459649A1 EP17799430.8A EP17799430A EP3459649A1 EP 3459649 A1 EP3459649 A1 EP 3459649A1 EP 17799430 A EP17799430 A EP 17799430A EP 3459649 A1 EP3459649 A1 EP 3459649A1
Authority
EP
European Patent Office
Prior art keywords
press
steel plate
thickness
formed product
varying
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17799430.8A
Other languages
German (de)
English (en)
Other versions
EP3459649A4 (fr
EP3459649B1 (fr
Inventor
Yoshiaki Nakazawa
Naruhiko Nomura
Toshiya Suzuki
Masahiro Kubo
Yasuhiro Ito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel and Sumitomo Metal Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel and Sumitomo Metal Corp filed Critical Nippon Steel and Sumitomo Metal Corp
Publication of EP3459649A1 publication Critical patent/EP3459649A1/fr
Publication of EP3459649A4 publication Critical patent/EP3459649A4/fr
Application granted granted Critical
Publication of EP3459649B1 publication Critical patent/EP3459649B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/04—Shaping in the rough solely by forging or pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/08—Accessories for handling work or tools
    • B21J13/10—Manipulators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J17/00—Forge furnaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B21J5/025—Closed die forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B21J9/06—Swaging presses; Upsetting presses
    • B21J9/08—Swaging presses; Upsetting presses equipped with devices for heating the work-piece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K23/00—Making other articles
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Definitions

  • the present invention relates to a method of producing a press-formed product composed of a steel plate, and a press-formed product production line.
  • providing a difference in the plate thickness is effective for achieving a further reduction in weight while ensuring the component performance.
  • the term "providing a difference in the plate thickness” used here refers to changing the plate thickness between a portion that governs component performance and a portion that has little influence on component performance.
  • a tailored blank is used as a steel plate that is supplied for press-working.
  • Such a tailored blank is one kind of varying-thickness steel plate, and includes a portion having a large thickness (hereunder, also referred to as "thick-wall portion") and a portion having a small thickness (hereunder, also referred to as "thin-wall portion").
  • Tailored blanks are broadly divided into the categories of tailored welded blanks (hereunder, also referred to as "TWB") as disclosed, for example, in Japanese Patent Application Publication No. 2005-206061 (Patent Literature 2), and tailored rolled blanks (hereunder, also referred to as "TRB") as disclosed, for example, in Japanese Patent Application Publication No. 2002-316229 (Patent Literature 3).
  • TWB tailored welded blanks
  • TRB tailored rolled blanks
  • a TWB is obtained by joining together a plurality of steel plates having different plate thicknesses and the like by welding.
  • a TRB is obtained by varying the plate thickness by adjusting a gap between rolling rolls that form a pair when producing a steel plate.
  • a plate thickness difference between a thick-wall portion and a thin-wall portion is not particularly large.
  • a ratio "t1/t2" between a plate thickness t1 of the thick-wall portion and a plate thickness t2 of the thin-wall portion is, at most, merely around 1.8.
  • the sizes of the respective regions of a thick-wall portion and a thin-wall portion must be reasonably large. Consequently, the degree of design freedom with respect to vehicle components is low. Accordingly, there is a limit to the degree to which the weight of a press-formed product can be lightened using a tailored blank.
  • the present invention has been made in view of the circumstances described above.
  • One objective of the present invention is to provide a production method and a production line of producing a press-formed product having high strength and for which a reduction in weight is possible.
  • a method of producing a press-formed product includes a steel plate heating step, a hot forging step and a hot stamping step.
  • a steel plate heating step a steel plate is heated to 950°C or more.
  • the hot forging step the steel plate is forged using a first press apparatus and a varying-thickness steel plate is formed.
  • a second press apparatus different from the first press apparatus is used.
  • the hot stamping step includes press-working to form the varying-thickness steel plate into a press-formed product by means of press tooling of the second press apparatus, and cooling the press-formed product inside the press tooling.
  • a press-formed product production line includes a forging press apparatus, a hot stamping press apparatus, at least one heating furnace and at least one manipulator.
  • a press-formed product that has high strength and for which a reduction in weight is possible can be produced.
  • a method of producing a press-formed product includes a steel plate heating step, a hot forging step, and a hot stamping (hereunder, also referred to as "HS") step.
  • a steel plate heating step a steel plate is heated to 950°C or more.
  • the hot forging step the steel plate is forged using a first press apparatus to form a varying-thickness steel plate.
  • a second press apparatus different from the first press apparatus is used.
  • the HS step includes press-working to form the varying-thickness steel plate into a press-formed product by means of press tooling of the second press apparatus, and cooling the press-formed product inside the press tooling.
  • the production method of the present embodiment also includes a preparation step.
  • a steel plate having a uniform thickness is prepared.
  • the production method of the present embodiment further includes a varying-thickness steel plate heating step.
  • the varying-thickness steel plate heating step after the hot forging step and before the HS step, the varying-thickness steel plate is heated to a temperature that is not less than the A c3 transformation point and is not more than "the A c3 transformation point + 150°C".
  • the production method of the present embodiment further includes a cooling step.
  • the varying-thickness steel plate is cooled.
  • the varying-thickness steel plate in this case has a portion that has a large thickness and a portion that has a small thickness.
  • a varying-thickness steel plate in which a plate thickness difference between a portion that has a large thickness (thick-wall portion) and a portion that has a small thickness (thin-wall portion) is large can be formed by hot forging. Further, the varying-thickness steel plate can be subjected to press-working and quenching by HS, and by this means a press-formed product in which the strength of each portion is high and which has a light weight can be obtained.
  • a press-formed product can be produced that has high strength and, furthermore, can be dramatically lightened in weight.
  • a press-formed product is applied, for example, to vehicle components of an automobile.
  • vehicle components include framework components (for example: pillars, side members, side sills, and cross members), suspension components (for example: toe-control links and suspension arms), and other reinforcement components (for example: bumper beams and door impact beams).
  • a ratio "t1/t2" (hereunder, also referred to as "plate thickness ratio”) between a plate thickness t1 of a portion that has a large thickness and a plate thickness t2 of a portion that has a small thickness to be more than 1.8. In this case, it is possible to further lighten the weight of the press-formed product.
  • the upper limit of the plate thickness ratio "t1/t2” is not particularly limited. When taking the uniformity of press formability and quenching in the HS step into consideration, the upper limit of the plate thickness ratio "t1/t2" may be 3.5.
  • the tensile strength of a press-formed product 1300 MPa or more it is possible to make the tensile strength of a press-formed product 1300 MPa or more.
  • the component performance improves in terms of the strength and weight (weight reduction) of the press-formed product.
  • the steel plate consists of, by mass%, C: 0.15 to 0.60%, Si: 0.001 to 2.0%, Mn: 0.5 to 3.0%, P: 0.05% or less, S: 0.01% or less, sol. Al: 0.001 to 1.0%, N: 0.01% or less and B: 0.01% or less, with the balance being Fe and impurities.
  • the steel plate may contain, in lieu of a part of Fe, 0.03 to 1.0% in total of one or more types of element selected from the group consisting of Ti, Nb, V, Cr, Mo, Cu and Ni. In this case, the tensile strength of the press-formed product can be made 1300 MPa or more.
  • a press-formed product production line includes a forging press apparatus, a HS press apparatus, at least one heating furnace and at least one manipulator. According to the production line of the present embodiment, the aforementioned press-formed product can be produced.
  • FIG. 1 is a flow chart illustrating a method of producing a press-formed product according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram that illustrates the process of the method of producing a press-formed product according to an embodiment of the present invention.
  • the production method of the present embodiment includes a preparation step (step #5), a first heating step (step #10), a hot forging step (step #15), a second heating step (step #20) and a hot stamping step (step #25).
  • the first heating step is a steel plate heating step.
  • the second heating step is a varying-thickness steel plate heating step.
  • each of these steps is described in detail referring to FIG. 1 and FIG. 2 .
  • the press-formed product 1 includes a top plate part 2, two vertical wall parts 3, two flange parts 4, two upper-side ridge line parts 5 and two lower-side ridge line parts 6.
  • the upper-side ridge line parts 5 connect the top plate part 2 and the vertical wall parts 3.
  • the lower-side ridge line parts 6 connect the vertical wall parts 3 and the flange parts 4.
  • the press-formed product 1 having the hat-shaped cross-section is applied, for example, to a bumper beam that is a vehicle component.
  • a bumper beam is arranged so that the top plate part 2 faces inward or outward with respect to the vehicle body.
  • a load produced by an impact propagates through the vertical wall parts 3.
  • the component performance required of a bumper beam is that, when an impact load is applied, the maximum load that can be withstood is high and the absorbed energy is large. Therefore, in a bumper beam, the portions which govern component performance are the vertical wall parts 3, the upper-side ridge line parts 5 and the lower-side ridge line parts 6, and the portions which have little influence on component performance are the top plate part 2 and the flange parts 4.
  • the plate thickness of the top plate part 2 and the flange parts 4 may be thin in comparison to the plate thicknesses of the vertical wall parts 3, the upper-side ridge line part 5 and the lower-side ridge line parts 6. If the strength of each part of the bumper beam is high and, in particular, the plate thickness of the top plate part 2 is thin, the bumper beam will have high strength and will also be light. In the press-formed product 1 illustrated in FIG. 2 , the plate thickness of the top plate part 2 is noticeably thinner than the plate thickness of the other portions.
  • a steel plate 10 is prepared as the starting material of the press-formed product 1.
  • the steel plate 10 is cut out from a hot-rolled steel plate or cold-rolled steel plate or the like that has a constant thickness.
  • the term "hot-rolled steel plate or cold-rolled steel plate that has a constant thickness” refers to a normal hot-rolled steel plate or cold-rolled steel plate, and in such a steel plate a plate thickness difference between the center in the width direction of a steel strip in a coil state after rolling and a position that is 25 mm from an edge is 0.2 mm or less.
  • Variations in the plate thickness of the steel plate 10 (blank) that was cut out from the hot-rolled steel plate or cold-rolled steel plate are, naturally, not more than 0.2 mm.
  • the thickness of the steel plate 10 is around 2.0 to 6.0 mm.
  • FIG. 2 the steel plate 10 that has been cut out in a rectangular shape to correspond to the shape of the press-formed product 1 having a hat-shaped cross-section is illustrated as an example.
  • the steel plate 10 is inserted into a first heating furnace 20 and is heated to 950°C or more.
  • the steel plate 10 is heated in this manner because the steel plate 10 is to be subjected to hot forging in the next step.
  • the heating temperature of the steel plate 10 is 1000°C or more.
  • the upper limit of the heating temperature is not particularly limited as long as the heating temperature is less than or equal to the fusing point of the steel material of the steel plate 10.
  • the heating temperature of the steel plate 10 is not more than 1350°C.
  • the heated steel plate 10 is taken out from the first heating furnace 20, and the steel plate 10 is then supplied to a forging press apparatus 21 and subjected to forging.
  • Press tooling 21a and 21b forming a pair on the upper and lower sides is used to perform the forging.
  • a region at one part of the steel plate 10 is repeatedly rolled in the thickness direction by means of the press tooling 21a and 21b.
  • the rolling region may be the entire area of the steel plate 10.
  • the forging may be closed die forging or may be open die forging.
  • the steel plate 10 is formed into a varying-thickness steel plate 11 by the hot forging.
  • the varying-thickness steel plate 11 has a thick-wall portion 12 and a thin-wall portion 13. Because the thick-wall portion 12 and the thin-wall portion 13 are formed by the hot forging in which the steel plate 10 is subjected to repeated rolling, the plate thickness difference between the thick-wall portion 12 and the thin-wall portion 13 can be made a large difference. In other words, it is possible for a plate thickness ratio "t1/t2" between a plate thickness t1 of the thick-wall portion 12 and a plate thickness t2 of the thin-wall portion 13 to be more than 1.8.
  • the varying-thickness steel plate 11 in which the plate thickness ratio "t1/t2" between the thick-wall portion 12 and the thin-wall portion 13 is not less than 1.8 and in which the thin-wall portion 13 is formed along the lengthwise direction at a center part in the width direction is illustrated as an example.
  • the size of each region of the thick-wall portion 12 and the thin-wall portion 13 is not limited. In a TRB, the size of each of these regions is limited to a size that is large to a certain extent. In addition, because the grain flow continues across the entire area of the thick-wall portion 12 and the thin-wall portion 13, a decrease in strength does not occur at a boundary between the thick-wall portion 12 and the thin-wall portion 13. This is not possible in the case of a TWB. Further, because the varying-thickness steel plate 11 is formed by hot forging, the internal structure of the varying-thickness steel plate 11, in particular the internal structure of the thin-wall portion 13 for which the roll draft is large, becomes compact and homogeneous.
  • a predetermined temperature e.g., 950°C
  • the varying-thickness steel plate 11 After hot forging, it is desirable to cool the varying-thickness steel plate 11 to a temperature that is lower than the A c3 transformation point. The reason is that, in a case where cooling is performed there is the advantage that the toughness of the end product (press-formed product) is superior in comparison to a case where cooling is not performed.
  • the varying-thickness steel plate 11 may be cooled to room temperature.
  • the cooling may be air-cooling or may be rapid cooling such as water-cooling.
  • the varying-thickness steel plate 11 is inserted into a second heating furnace 22 and is heated to a temperature that is not less than the A c3 transformation point and not more than "the A c3 transformation point + 150°C". This is because the varying-thickness steel plate 11 will be subjected to HS (press-working and quenching) in the next step.
  • HS press-working and quenching
  • the internal structure of the varying-thickness steel plate 11 becomes austenite.
  • the second heating furnace 22 may be a furnace that is used exclusively for the second heating step, or the first heating furnace 20 that is used for the first heating step may be shared for use in the second heating step. However, the second heating step is not necessarily required.
  • the second heating step can be omitted.
  • the second heating step is necessary.
  • the temperature of the varying-thickness steel plate 11 that is supplied to the subsequent HS step is nonuniform or is less than the A c3 transformation point, there is a risk that quenching defects will arise and that there will be places at which the desired strength is not obtained in the end product.
  • the varying-thickness steel plate 11 at a temperature that is not less than the A c3 transformation point and not more than "the A c3 transformation point + 150°C" is fed into a hot stamping press apparatus 23 and is subjected to HS.
  • a hot stamping press apparatus 23 In order to make the temperature of the varying-thickness steel plate 11 not less than the A c3 transformation point and not more than "the A c3 transformation point + 150°C", for example, it suffices to heat the varying-thickness steel plate 11 at the second heating furnace 22.
  • the hot stamping press apparatus 23 is different from the forging press apparatus 21.
  • Press tooling e.g.: a die and a punch
  • Press tooling 23a and 23b forming a pair on the upper and lower sides is used to carry out the HS.
  • the varying-thickness steel plate 11 is subjected to press-working by the press tooling 23a and 23b to form the press-formed product 1, and the formed press-formed product 1 is cooled inside the press tooling 23a and 23b.
  • the cooling of the press-formed product 1 inside the press tooling 23a and 23b is rapid cooling.
  • the term "rapid cooling” refers to cooling at a cooling speed that transforms into martensite or bainite. In the case of performing another separate HS step after the current HS step, a structure mainly composed of bainite is allowed.
  • the cooling is performed by circulating cooling water inside the press tooling 23a and 23b to thereby cause heat exchange between the press tooling 23a and 23b and the press-formed product 1.
  • cooling may be performed by directly emitting cooling water from the press tooling 23a and 23b onto the press-formed product 1.
  • the press-formed product 1 having the desired dimensions and shape is formed by the press-working in the HS step.
  • the thin-wall portion 13 of the varying-thickness steel plate 11 is formed into the top plate part 2 of the press-formed product 1.
  • the thick-wall portion 12 of the varying-thickness steel plate 11 is formed into the upper-side ridge line parts 5, the vertical wall parts 3, the lower-side ridge line parts 6 and the flange parts 4 of the press-formed product 1.
  • the press-formed product 1 is quenched by cooling in the HS step.
  • the quenching causes the internal structure of the press-formed product 1 to transform from austenite into a hard phase such as martensite, and become a martensitic micro-structure (including a bainitic structure).
  • a hard phase such as martensite
  • a martensitic micro-structure including a bainitic structure
  • the volume fraction of the martensitic micro-structure is 80% or more.
  • the press-formed product 1 formed as described above has a martensitic micro-structure throughout the whole area thereof, the strength of each part is high. For example, if the chemical composition of the steel plate 10 used as a starting material is adjusted, the tensile strength of the press-formed product 1 will be 1300 MPa or more. Further, the varying-thickness steel plate 11 having a compact internal structure is formed by hot forging. Because the press-formed product 1 is formed from the varying-thickness steel plate 11, the toughness of the press-formed product 1 is high. The reason is that coarsening of the grain size of austenite ( ⁇ grain size) that is the source of the martensite is suppressed by forging.
  • the varying-thickness steel plate 11 in which the plate thickness ratio is large is formed by hot forging. Because the press-formed product 1 is formed from the varying-thickness steel plate 11, the weight of the press-formed product 1 is light. Therefore, according to the production method of the present embodiment, the press-formed product 1 that has high strength and for which a reduction in weight is also possible can be produced.
  • the steel plate according to the present embodiment that is described here is a steel plate in which the tensile strength after quenching is 1300 MPa or more.
  • the chemical composition of the steel plate contains the following elements.
  • the symbol "%" used in relation to an element means “mass%” unless specifically stated otherwise.
  • the strength after quenching mainly depends on the content of carbon (C) that governs the hardness of the martensite phase. Therefore, the C content is determined according to the required strength. To secure a tensile strength of 1300 MPa or more, the C content is 0.15% or more. More preferably, the C content is more than 0.20%. On the other hand, if the C content is too high, the toughness after quenching will decrease, and the risk of a brittle fracture occurring will increase. Therefore, the upper limit of the C content is 0.60%. A preferable upper limit of the C content is 0.50%.
  • Si Silicon
  • Si inhibits the formation of carbides during the course of cooling from the austenite phase until transformation to a low-temperature transformation phase.
  • Si increases the strength after quenching without causing a deterioration in ductility, and in some cases improves ductility. This effect is not obtained if the Si content is too low. Therefore, the Si content is 0.001% or more. More preferably, the Si content is 0.05% or more.
  • the Si content is 2.0% or less. More preferably, the Si content is 1.5% or less.
  • Manganese (Mn) increases the hardenability of the steel and stabilizes the strength after quenching. However, if the Mn content is too low, it is difficult to secure a tensile strength of 1300 MPa or more. Therefore, the Mn content is 0.5% or more. More preferably, the Mn content is 1.0% or more. If the Mn content is 1.0% or more, it is possible to secure a tensile strength of 1350 MPa or more. On the other hand, if the Mn content is too high, the band-like martensitic micro-structure will become nonuniform, and a deterioration in impact characteristics will be noticeable. Therefore, the Mn content is 3.0% or less. When taking into consideration the alloy cost and the like, an upper limit of the Mn content is 2.5%.
  • phosphorus (P) is generally an impurity that is unavoidably contained in the steel, P increases the strength by solid-solution strengthening. On the other hand, if the P content is too high, a deterioration in the weldability is noticeable. Further, in a case where the aim is to achieve a tensile strength of 2500 MPa or more, the risk of brittle fractures increases. Therefore, the P content is 0.05% or less. More preferably, the P content is 0.02% or less.
  • the lower limit of P content is not particularly limited. To more surely obtain the aforementioned effect, the lower limit of the P content may be 0.003%.
  • S Sulfur
  • S is an impurity that is unavoidably contained in the steel, and binds with Mn or Ti to form sulfides, and precipitates. If the amount of the precipitates increases too much, interfaces between the precipitates and the main phase may become the starting point of fractures. Thus it is preferable for the S content to be low. Therefore, the S content is 0.01% or less. More preferably, the S content is 0.008% or less.
  • the lower limit of the S content is not particularly limited. When taking the production cost into consideration, the lower limit of the S content may be 0.0015%, and more preferably may be 0.003%.
  • Aluminum (Al) deoxidizes the steel to enhance the state of the steel material, and also improves the yield of carbo-nitride-forming elements such as Ti. If the Al content is too low, it is difficult to obtain the aforementioned effect. Therefore, the Al content is 0.001% or more. More preferably, the Al content is 0.015% or more. On the other hand, if the Al content is too high, a decline in weldability will be noticeable, and oxide inclusions in the steel will increase and a deterioration in the surface texture of the steel will be noticeable. Therefore, the Al content is 1.0% or less. More preferably, the Al content is 0.080% or less. In the present specification, the term "Al content” means the content of sol. Al (acid-soluble Al).
  • N Nitrogen
  • the N content is an impurity that is unavoidably contained in the steel.
  • the N content is low.
  • the N content is 0.01% or less. More preferably, the N content is 0.006% or less.
  • the lower limit of the N content is not particularly limited. When taking into consideration the production cost, the lower limit of the N content may be 0.0015%.
  • B Boron
  • the B content is 0.01% or less. More preferably, the B content is 0.0050% or less.
  • the lower limit of the B content is not particularly limited. In order to more surely obtain the aforementioned effect, the B content may be 0.0003% or more.
  • the balance of the chemical composition of the steel plate according to the present embodiment is Fe and impurities.
  • impurities refers to elements which, during industrial production of the steel plate, are mixed in from ore or scrap that is used as a raw material, or from the production environment or the like, and which are allowed within a range that does not adversely affect the steel plate of the present embodiment.
  • the aforementioned steel plate may further contain 0.03 to 1.0% in total of one or more types of element selected from the group consisting of Ti, Nb, V, Cr, Mo, Cu and Ni in lieu of a part of Fe.
  • Each of these elements is an optional element, and each of these elements increases the hardenability of the steel, and stabilizes the toughness or strength of the steel after quenching.
  • the lower limit of the total content of the optional elements is 0.03%.
  • the upper limit of the total content of the optional elements is 1.0%.
  • a c3 transformation point of the steel plate according to the present embodiment is calculated, for example, by the following Formula (1).
  • a c 3 910 ⁇ 203 ⁇ ⁇ C ) ⁇ 15.2 ⁇ Ni + 44.7 ⁇ Si + 104 ⁇ V + 31.5 ⁇ Mo ⁇ 30 ⁇ Mn ⁇ 11 ⁇ Cr ⁇ 20 ⁇ Cu + 700 ⁇ P + 400 ⁇ 50 ⁇ Ti
  • FIG. 3 is a schematic diagram illustrating an example of a press-formed product production line.
  • the press-formed product production line includes the forging press apparatus 21, the HS press apparatus 23, at least one heating furnace 20 and at least one manipulator 50.
  • the production line also includes a control unit 51 for controlling all of these apparatuses 21, 23, 20 and 50.
  • the forging press apparatus 21 is used in the aforementioned hot forging step.
  • the forging press apparatus 21 forges a varying-thickness steel plate by repeatedly beating a high-temperature steel plate (blank) using the press tooling 21a and 21b. It is desirable for the forging press apparatus 21 to have a cooling apparatus for cooling the forged varying-thickness steel plate. The reason for this is to obtain an end product (press-formed product) that is excellent in toughness.
  • the HS press apparatus 23 is used in the aforementioned HS step.
  • the HS press apparatus 23 subjects a high-temperature varying-thickness steel plate to press-working by means of the press tooling 23a and 23b to thereby form a press-formed product.
  • the press-formed product is cooled inside the press tooling 23a and 23b that are cooled, or is cooled inside the press tooling 23a and 23b by means of cooling water emitted from the press tooling 23a and 23b, and thereby quenched.
  • the cooling speed and cooling end-point temperature are appropriately controlled for the press-formed product that was formed at a temperature that is not lower than the A c3 transformation point.
  • the thick-wall portion is more difficult to cool than the thin-wall portion. The reason is that the heat capacity of the thick-wall portion is large in comparison to the thin-wall portion. Therefore, it is desirable to subject the thick-wall portion to stronger cooling than the thin-wall portion.
  • the metal micro-structure In the thick-wall portion, formation of the desired hard metal micro-structure will be insufficient unless the intended cooling speed is applied. In such a case, in the press-formed product, the metal micro-structure will be nonuniform, and the strength will also be nonuniform. In addition, depending on differences in thermal contraction and differences in phase transformation strain that arises because of differences in the metal micro-structure, it may be difficult to obtain the intended dimensional accuracy of the shape. Further, if an interface part between the thick-wall portion and the thin-wall portion is cooled at a faster speed than the thick-wall portion and the thin-wall portion, the strength at the interface part will be higher than at other parts. In this case, there is a risk that when an impact load is applied to the press-formed product, the interface part will rupture due to secondary deformation.
  • FIG. 4A to FIG. 4C are cross-sectional views that illustrate a first specific example of a HS press apparatus.
  • FIG. 4A illustrates a state in an initial stage of working
  • FIG. 4B illustrates a state in a middle stage of working
  • FIG. 4C illustrates a state in a final stage of working.
  • a HS press apparatus 30 shown in FIG. 4A to FIG. 4C includes an upper die 31 and a lower die 32.
  • the upper die 31 includes a first face 31a that corresponds to the thick-wall portion 12, and a second face 31b that corresponds to the thin-wall portion 13.
  • a height h2 of a step height between the first face 31a and the second face 31b in the upper die 31 is less than a height h1 of a step height between the thick-wall portion 12 and the thin-wall portion 13 in the varying-thickness steel plate 11.
  • the upper die 31 is supported by an upper die holder (not shown in the drawings). Cooling water circulates inside the upper die 31.
  • the high-temperature varying-thickness steel plate 11 including the thick-wall portion 12 and the thin-wall portion 13 is placed on the lower die 32.
  • FIG. 4B when the upper die holder descends, first, the first face 31a of the upper die 31 contacts the thick-wall portion 12 of the varying-thickness steel plate 11. When the upper die holder descends further, the thick-wall portion 12 is worked by the first face 31a.
  • the second face 31b of the upper die 31 contacts the thin-wall portion 13 of the varying-thickness steel plate 11.
  • the thin-wall portion 13 is worked by the second face 31b.
  • FIG. 5A to FIG. 5C are cross-sectional views illustrating a second specific example of the HS press apparatus.
  • FIG. 5A illustrates a state in an initial stage of working
  • FIG. 5B illustrates a state in a middle stage of working
  • FIG. 5C illustrates a state in a final stage of working.
  • a HS press apparatus 40 shown in FIG. 5A to FIG. 5C includes a first upper die 41, a second upper die 42 and a lower die 43.
  • the first upper die 41 is disposed at a position corresponding to the thick-wall portion 12.
  • the second upper die 42 is disposed at a position corresponding to the thin-wall portion 13.
  • the first upper die 41 is supported by an upper die holder 44 via a first pressurization member 45.
  • the second upper die 42 is supported by the upper die holder 44 via a second pressurization member 46.
  • the first and second pressurization members 45 and 46 are hydraulic cylinders or springs or the like. Cooling water circulates inside the first and second upper dies 41 and 42.
  • the high-temperature varying-thickness steel plate 11 including the thick-wall portion 12 and the thin-wall portion 13 is placed on the lower die 43.
  • the first upper die 41 contacts the thick-wall portion 12 of the varying-thickness steel plate 11.
  • the first pressurization member 45 contracts while applying pressure to the first upper die 41, and the thick-wall portion 12 is worked by the first upper die 41.
  • the second upper die 42 contacts the thin-wall portion 13 of the varying-thickness steel plate 11.
  • the second pressurization member 46 contracts while applying pressure to the second upper die 42, and the thin-wall portion 13 is worked by the second upper die 42.
  • the heating furnace 20 is used in the aforementioned first heating step and second heating step.
  • the heating furnace 20 heats the steel plate (blank) prior to hot forging. Further, the heating furnace 20 heats the varying-thickness steel plate obtained by the hot forging.
  • the steel plate is heated to 950°C or more.
  • the varying-thickness steel plate is heated to a temperature that is not less than the A c3 transformation point and not more than "the A c3 transformation point + 150°C".
  • the production line may have one heating furnace 20, and the heating furnace 20 may be used in a shared manner for the first and second heating steps. However, in some cases the heating temperature that is the target of the first heating step and the heating temperature that is the target of the second heating step do not match.
  • the production line may also include two or more heating furnaces 20, with the respective heating furnaces 20 being used exclusively for respective heating steps.
  • steel plates are heated to 900°C or more, humans cannot directly handle the steel plates. Therefore, conveyance of the steel plates is performed by a machine.
  • the steel plates are inserted between the upper and lower press tooling of the forging press apparatus 21 and are taken out therefrom.
  • the steel plates are inserted between the upper and lower press tooling of the HS press apparatus 23 and are taken out therefrom. Therefore, conveyance of the steel plates is performed by a manipulator 50 (conveyance robot) that can lift the steel plates.
  • the conveyance operations that the manipulator 50 performs are as follows:
  • the production line may include one manipulator 50, and the manipulator 50 may be responsible for all of the conveyance operations.
  • the production line may include a plurality of the manipulators 50, and the conveyance operations may be distributed between the respective manipulators 50.
  • the movable range of the manipulator 50 is set so as to include the conveyance destination and conveyance origin for each of the apparatuses 21, 23 and 20.
  • the temperature of a blank that has been taken out from the heating furnace 20 gradually falls. Therefore, it is necessary to manage the time period for which the blank is conveyed by the manipulator 50 and also the heating temperature of the heating furnace 20. Furthermore, it is necessary that the operations to take out steel plates and operations to insert steel plates by the manipulator 50 are performed in coordination with the operations of the heating furnace 20 and press apparatuses 21 and 23. For these reasons, each of the apparatuses 21, 23 and 20 included in the production line is controlled by the control unit 51.
  • the control unit 51 outputs signals for controlling opening and closing of the door of the heating furnace 20 and operations of the manipulator 50.
  • a plurality of steel plates (blanks) or steel plates of varying thickness are housed inside the heating furnace 20.
  • the housing status of the respective steel plates in the heating furnace 20 is recorded in a memory of the control unit 51.
  • Whether or not to take steel plates out from the heating furnace 20 is determined by the control unit 51 based on the in-furnace temperature of the heating furnace 20 and the time periods for which the respective steel plates have been in the heating furnace 20.
  • the control unit 51 has, for example, the following functions:
  • signals such as a working preparation completion signal and a working completion signal are input to the control unit 51 from the forging press apparatus 21 and the HS press apparatus 23.
  • the operation control of the manipulator 50 may be control of the position of the manipulator 50 from moment to moment. Further, the operation control of the manipulator 50 may be control whereby the manipulator 50 performs a predetermined operation in response to output of a signal from the control unit 51.
  • the control unit 51 may be equipped with a function that changes a temperature at which to take out a blank from the heating furnace 20 according to the ambient air temperature.
  • the control unit 51 may also be equipped with a function that changes a conveyance time period for conveyance from the heating furnace 20 to the forging press apparatus 21 and the HS press apparatus 23 according to the ambient air temperature.
  • Numerical analysis tests described hereunder were performed to verify the effects of the method of producing a press-formed product of the present embodiment. Specifically, based on the assumption of use for a bumper beam, two kinds of analytical models having a hat-shaped cross-section were prepared. For each model, a numerical analysis that simulated a three-point bending crush test was performed. In general, a three-point bending crush test is used to evaluate the performance of a bumper beam.
  • FIG. 6A and FIG. 6B are cross-sectional views that schematically illustrate analytical models used in the bending test of the Examples.
  • FIG. 6A illustrates an analytical model of a Comparative Example
  • FIG. 6B illustrates an analytical model of an Inventive Example of the present invention.
  • a model A of the Comparative Example was formed with a constant plate thickness of 2.0 mm over the whole area thereof.
  • the plate thickness of a top plate part 2 was made 1.0 mm that was one-half of the plate thickness of the other portions.
  • the tensile strength was made 1300 MPa in both model A and model B.
  • a common closing plate (not shown in the drawings) was joined to the flange parts 4, and the space between the flange parts 4 was closed by means of the closing plate.
  • Model A and model B were each supported at two points from the closing plate side.
  • the interval between the support points of the respective models A and B was 800 mm.
  • An impactor was caused to impact at the center of the support points of the respective models A and B from the top plate part 2 side to thereby crush the respective models A and B.
  • the radius of curvature at a front end part of the impactor was 150 mm.
  • the impact velocity of the impactor was 9 km/h.
  • FIG. 7 is a view that summarizes the test results of the Examples. The facts described hereunder were found based on the results shown in FIG. 7 .
  • the present invention is not limited to the embodiment described above, and various modifications may be made within a range that does not deviate from the gist of the present invention.
  • the method of producing a press-formed product of the present invention can be effectively utilized in the production of a press-formed product for an automobile for which enhanced strength is required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Forging (AREA)
  • Heat Treatment Of Articles (AREA)
EP17799430.8A 2016-05-18 2017-05-17 Procédé de production de produits formés pressés et ligne de fabrication de produits formés pressés Active EP3459649B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016099862 2016-05-18
PCT/JP2017/018535 WO2017200006A1 (fr) 2016-05-18 2017-05-17 Procédé de fabrication d'un article formé à la presse, et chaîne de fabrication

Publications (3)

Publication Number Publication Date
EP3459649A1 true EP3459649A1 (fr) 2019-03-27
EP3459649A4 EP3459649A4 (fr) 2019-04-03
EP3459649B1 EP3459649B1 (fr) 2021-06-23

Family

ID=60325220

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17799430.8A Active EP3459649B1 (fr) 2016-05-18 2017-05-17 Procédé de production de produits formés pressés et ligne de fabrication de produits formés pressés

Country Status (10)

Country Link
US (1) US10744547B2 (fr)
EP (1) EP3459649B1 (fr)
JP (1) JP6388084B2 (fr)
KR (2) KR101992077B1 (fr)
CN (1) CN109153060B (fr)
BR (1) BR112018073277A2 (fr)
CA (1) CA3024539C (fr)
MX (1) MX370243B (fr)
RU (1) RU2708283C1 (fr)
WO (1) WO2017200006A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3511086A4 (fr) * 2016-09-06 2019-12-11 Nippon Steel & Sumitomo Metal Corporation Dispositif de presse à chaud

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6575015B2 (ja) * 2017-07-07 2019-09-18 本田技研工業株式会社 車体構造
JP7155986B2 (ja) * 2018-12-13 2022-10-19 トヨタ自動車株式会社 鋼板部材及びその製造方法
CN110039313B (zh) * 2019-05-24 2024-03-29 东营哈东工业技术研究院有限责任公司 一种节能型热成形钢类零件分步成形装备及工艺
CN110935803B (zh) * 2019-11-29 2022-01-04 中国华西企业有限公司 一种厚钢板的变形处理方法
CN111571235B (zh) * 2020-05-12 2022-06-14 艾伯纳工业炉(太仓)有限公司 一种金属板材的热成型生产线
JPWO2022045069A1 (fr) * 2020-08-28 2022-03-03
CN112045125A (zh) * 2020-09-30 2020-12-08 江苏永茂普隆汽车配件制造有限公司 一种锻件的精确锻造工艺
CN113000752B (zh) * 2021-04-08 2022-11-08 重庆大学 一种锻件高压水除鳞装置及方法
CN114434099B (zh) * 2021-12-30 2023-07-07 富联裕展科技(深圳)有限公司 终端边框制造方法、终端边框、终端及生产线
CN114798945A (zh) * 2022-04-29 2022-07-29 永康中奥自动化科技有限公司 一种带机械手的液压拉伸设备
CN114713712B (zh) * 2022-05-10 2024-05-07 合肥海德数控液压设备有限公司 一种带拔伸冲孔功能的热冲压自动化生产线
CN116493536B (zh) * 2023-06-30 2023-09-15 苏州铂源航天航空新材料有限公司 一种航空钛合金件锻造装置

Family Cites Families (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2586881A (en) * 1950-01-03 1952-02-26 M B Mfg Company Inc Driving unit for electromagnetic vibration exciters
SE435527B (sv) * 1973-11-06 1984-10-01 Plannja Ab Forfarande for framstellning av en detalj av herdat stal
SU1558706A1 (ru) * 1987-12-08 1990-04-23 Воронежское производственное объединение по выпуску тяжелых механических прессов "Воронежтяжмехпресс" Автоматизированна лини дл штамповки лонжеронов
US5928604A (en) * 1996-11-27 1999-07-27 Caterpillar Inc. Automated system for carburizing a component
JPH11104750A (ja) * 1997-09-30 1999-04-20 Nissan Motor Co Ltd 突き合わせ溶接板のプレス成形方法
DE10049660B4 (de) * 2000-10-07 2005-02-24 Daimlerchrysler Ag Verfahren zum Herstellen lokal verstärkter Blechumformteile
CN1166469C (zh) * 2000-11-27 2004-09-15 中国第二重型机械集团公司 带整体支承裙座的厚壁封头的制造方法
JP4801277B2 (ja) 2001-04-20 2011-10-26 本田技研工業株式会社 車体パネルの成形方法
JP4325277B2 (ja) 2003-05-28 2009-09-02 住友金属工業株式会社 熱間成形法と熱間成形部材
JP4415684B2 (ja) 2004-01-23 2010-02-17 トヨタ自動車株式会社 サイドメンバのキックアップ部構造
JP4677821B2 (ja) * 2005-04-22 2011-04-27 日産自動車株式会社 差厚板の製造方法および製造装置
JP4321548B2 (ja) * 2005-07-14 2009-08-26 Ｊｆｅスチール株式会社 熱間鍛造設備
KR20050080133A (ko) * 2005-07-15 2005-08-11 대한금속(주) 볼 하우징의 제조방법
DE102005051403B3 (de) * 2005-10-25 2007-03-15 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines Blechformteiles
CN100453203C (zh) 2006-09-12 2009-01-21 钟六妹 一种优质碳素钢钩、环类零件的锻造方法
CN101293255A (zh) 2008-06-17 2008-10-29 钢铁研究总院 经济型热成型马氏体钢板生产方法
DE102009003508B4 (de) * 2009-02-19 2013-01-24 Thyssenkrupp Steel Europe Ag Verfahren zur Herstellung eines pressgehärteten Metallbauteils
CN101486060B (zh) * 2009-02-24 2010-12-29 山东大学 高强度钢零件的热成形和冲孔一体化工艺及模具
DE102009025821B4 (de) * 2009-05-18 2011-03-31 Thyssenkrupp Steel Europe Ag Verfahren zur Herstellung eines Metallbauteils
KR100993988B1 (ko) * 2010-01-29 2010-11-11 현대하이스코 주식회사 간접 핫 스탬핑 성형방법
WO2012120692A1 (fr) * 2011-03-09 2012-09-13 新日本製鐵株式会社 Feuilles d'acier destinées à l'estampage à chaud, procédé pour leur fabrication et procédé pour la fabrication de parties hautement résistantes
US9238847B2 (en) * 2011-08-05 2016-01-19 Honda Motor Co., Ltd. Tailored hardening of boron steel
DE102011117265A1 (de) * 2011-10-28 2013-05-02 GEDIA Gebrüder Dingerkus GmbH Verfahren zur Herstellung eines Formteiles aus hochfestem oder höchstfestem Stahl
JP6115313B2 (ja) * 2013-05-24 2017-04-19 新日鐵住金株式会社 差厚鋼板製品の製造ライン及び製造方法
PL3085801T3 (pl) * 2013-12-20 2020-04-30 Nippon Steel Corporation Element z blachy stalowej cienkiej wytłaczanej na gorąco i sposób jego wytwarzania
JP2015188927A (ja) * 2014-03-28 2015-11-02 大同特殊鋼株式会社 鍛造部材の製造方法
KR20160002251A (ko) * 2014-06-30 2016-01-07 주식회사 신영 핫스탬핑용 냉각 장치
JP2016059926A (ja) * 2014-09-16 2016-04-25 ダイハツ工業株式会社 熱間プレス加工用板金材の搬送装置
EP3211103B1 (fr) * 2016-02-25 2020-09-30 Benteler Automobiltechnik GmbH Procédé de fabrication d'un élément de véhicule automobile comprenant au moins deux zones de fixation différentes l'une de l'autre

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3511086A4 (fr) * 2016-09-06 2019-12-11 Nippon Steel & Sumitomo Metal Corporation Dispositif de presse à chaud

Also Published As

Publication number Publication date
JP6388084B2 (ja) 2018-09-12
US20190091748A1 (en) 2019-03-28
CA3024539A1 (fr) 2017-11-23
RU2708283C1 (ru) 2019-12-05
JPWO2017200006A1 (ja) 2018-05-31
KR20180137032A (ko) 2018-12-26
KR101992077B1 (ko) 2019-06-21
MX370243B (es) 2019-12-04
MX2018014105A (es) 2019-04-29
CN109153060A (zh) 2019-01-04
EP3459649A4 (fr) 2019-04-03
KR20190053305A (ko) 2019-05-17
EP3459649B1 (fr) 2021-06-23
CA3024539C (fr) 2019-03-26
US10744547B2 (en) 2020-08-18
BR112018073277A2 (pt) 2019-02-19
WO2017200006A1 (fr) 2017-11-23
CN109153060B (zh) 2021-06-25

Similar Documents

Publication Publication Date Title
EP3459649B1 (fr) Procédé de production de produits formés pressés et ligne de fabrication de produits formés pressés
US9359663B2 (en) Manufacturing method for hot press formed steel member
CN106399837B (zh) 热冲压成形用钢材、热冲压成形工艺及热冲压成形构件
EP2832466B1 (fr) Procédé de fabrication pour un élément en acier moulé par pressage à chaud et élément en acier moulé par pressage à chaud
CN113249556B (zh) 具有至少两个强度不同的区域的汽车组件的制备方法
US9358602B2 (en) Method for producing press-formed product
US9315876B2 (en) Press-formed product and method for producing same
Billur Hot formed steels
JP2010236560A (ja) 衝撃吸収特性に優れた構造部材の製造方法
CN108602105B (zh) 板状成形品、车辆用门以及板状成形品的制造方法
Vrolijk et al. Supporting lightweight design: virtual modeling of hot stamping with tailored properties and warm and hot formed aluminium
US20230027898A1 (en) Vehicle floor and corresponding production method
JP7124967B2 (ja) 衝撃吸収部材、および、衝撃吸収部材の製造方法
Billur et al. Advancements in tailored hot stamping simulations: cooling channel and distortion analyses
CN115125444B (zh) 一种q550me厚壁自由锻件及提高其力学性能的热加工方法
Diekmann et al. Development and Characterization of New Low Alloyed Ultra-High Strength Steel for Structural Body Components
US20220049324A1 (en) Method for manufacturing steel sheet for cold press and method for manufacturing press component
Mendiguren et al. Press hardening of alternative materials: conventional high-strength steels
JP5717024B2 (ja) 薄肉鋼加工品及びその熱処理方法
KR20230160387A (ko) 프레스 성형 방법 및 프레스 성형품의 형상 평가 방법
Dziedzic et al. Material Aspects of Hot Rolling and Cooling Conditions for Strips from Martensitic Steel

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20181121

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

A4 Supplementary search report drawn up and despatched

Effective date: 20190301

RIC1 Information provided on ipc code assigned before grant

Ipc: C22C 38/58 20060101ALI20190225BHEP

Ipc: B21D 22/02 20060101ALI20190225BHEP

Ipc: B21J 9/08 20060101ALI20190225BHEP

Ipc: B21J 1/04 20060101ALI20190225BHEP

Ipc: B21J 5/02 20060101ALI20190225BHEP

Ipc: C22C 38/06 20060101ALI20190225BHEP

Ipc: B21J 9/00 20060101ALI20190225BHEP

Ipc: B21D 13/02 20060101ALI20190225BHEP

Ipc: B21K 23/00 20060101ALI20190225BHEP

Ipc: C22C 38/00 20060101ALI20190225BHEP

Ipc: B21D 17/02 20060101ALI20190225BHEP

Ipc: B21J 17/00 20060101ALI20190225BHEP

Ipc: B21J 5/00 20060101ALI20190225BHEP

Ipc: B21J 13/10 20060101ALI20190225BHEP

Ipc: B21D 22/20 20060101AFI20190225BHEP

Ipc: B21J 1/06 20060101ALI20190225BHEP

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: NIPPON STEEL CORPORATION

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20200205

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Ref document number: 602017040895

Country of ref document: DE

Free format text: PREVIOUS MAIN CLASS: B21D0022200000

Ipc: C22C0038020000

RIC1 Information provided on ipc code assigned before grant

Ipc: B21D 22/02 20060101ALI20200527BHEP

Ipc: B21J 5/02 20060101ALI20200527BHEP

Ipc: C22C 38/00 20060101ALI20200527BHEP

Ipc: C21D 9/46 20060101ALI20200527BHEP

Ipc: C21D 1/18 20060101ALI20200527BHEP

Ipc: B21J 17/00 20060101ALI20200527BHEP

Ipc: B21J 1/06 20060101ALI20200527BHEP

Ipc: B21J 5/00 20060101ALI20200527BHEP

Ipc: C22C 38/02 20060101AFI20200527BHEP

Ipc: C21D 6/00 20060101ALI20200527BHEP

Ipc: C22C 38/06 20060101ALI20200527BHEP

Ipc: C21D 7/13 20060101ALI20200527BHEP

Ipc: C22C 38/04 20060101ALI20200527BHEP

Ipc: B21J 1/04 20060101ALI20200527BHEP

Ipc: B21J 13/10 20060101ALI20200527BHEP

Ipc: B21K 23/00 20060101ALI20200527BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20200706

GRAJ Information related to disapproval of communication of intention to grant by the applicant or resumption of examination proceedings by the epo deleted

Free format text: ORIGINAL CODE: EPIDOSDIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

INTC Intention to grant announced (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20201223

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SUZUKI, TOSHIYA

Inventor name: ITO, YASUHIRO

Inventor name: NAKAZAWA, YOSHIAKI

Inventor name: NOMURA, NARUHIKO

Inventor name: KUBO, MASAHIRO

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

RIN1 Information on inventor provided before grant (corrected)

Inventor name: NAKAZAWA, YOSHIAKI

Inventor name: NOMURA, NARUHIKO

Inventor name: SUZUKI, TOSHIYA

Inventor name: KUBO, MASAHIRO

Inventor name: ITO, YASUHIRO

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602017040895

Country of ref document: DE

Ref country code: AT

Ref legal event code: REF

Ref document number: 1404380

Country of ref document: AT

Kind code of ref document: T

Effective date: 20210715

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210923

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1404380

Country of ref document: AT

Kind code of ref document: T

Effective date: 20210623

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210924

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210923

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20210623

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211025

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602017040895

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20220324

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20220531

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20220517

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220517

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220531

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220517

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220517

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220531

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20230331

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20170517

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210623